| … | |
… | |
| 92 | |
92 | |
| 93 | /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */ |
93 | /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */ |
| 94 | /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */ |
94 | /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */ |
| 95 | |
95 | |
| 96 | #if ECB_NO_THREADS |
96 | #if ECB_NO_THREADS |
| 97 | # define ECB_NO_SMP 1 |
97 | #define ECB_NO_SMP 1 |
| 98 | #endif |
98 | #endif |
| 99 | |
99 | |
| 100 | #if ECB_NO_SMP |
100 | #if ECB_NO_SMP |
| 101 | #define ECB_MEMORY_FENCE do { } while (0) |
101 | #define ECB_MEMORY_FENCE do { } while (0) |
| 102 | #endif |
102 | #endif |
| … | |
… | |
| 145 | #elif defined __clang && __has_feature (cxx_atomic) |
145 | #elif defined __clang && __has_feature (cxx_atomic) |
| 146 | /* see above */ |
146 | /* see above */ |
| 147 | #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST) |
147 | #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST) |
| 148 | #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__ |
148 | #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__ |
| 149 | #define ECB_MEMORY_FENCE __sync_synchronize () |
149 | #define ECB_MEMORY_FENCE __sync_synchronize () |
| 150 | /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */ |
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| 151 | /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */ |
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| 152 | #elif _MSC_VER >= 1400 /* VC++ 2005 */ |
150 | #elif _MSC_VER >= 1400 /* VC++ 2005 */ |
| 153 | #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) |
151 | #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) |
| 154 | #define ECB_MEMORY_FENCE _ReadWriteBarrier () |
152 | #define ECB_MEMORY_FENCE _ReadWriteBarrier () |
| 155 | #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */ |
153 | #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */ |
| 156 | #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier () |
154 | #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier () |
| … | |
… | |
| 173 | /* not just C11 atomics and atomic accesses */ |
171 | /* not just C11 atomics and atomic accesses */ |
| 174 | #include <stdatomic.h> |
172 | #include <stdatomic.h> |
| 175 | /* unfortunately, the C11 memory model seems to be very limited, and unable to express */ |
173 | /* unfortunately, the C11 memory model seems to be very limited, and unable to express */ |
| 176 | /* simple barrier semantics. That means we need to take out thor's hammer. */ |
174 | /* simple barrier semantics. That means we need to take out thor's hammer. */ |
| 177 | #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst) |
175 | #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst) |
| 178 | #endif |
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| 179 | #endif |
176 | #endif |
| 180 | #endif |
177 | #endif |
| 181 | |
178 | |
| 182 | #ifndef ECB_MEMORY_FENCE |
179 | #ifndef ECB_MEMORY_FENCE |
| 183 | #if !ECB_AVOID_PTHREADS |
180 | #if !ECB_AVOID_PTHREADS |
